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- Air with a density of 0.45 kg⁄m3 enters an experimental jet engine at rate of 180 m/s. The inlet area of the engine is 0.5 m2 . After fuel is burned, the air and combustion byproducts leave the engine with a velocity of 650 m/s through an outlet area of 0.4 m . What is the average density of the gas exiting the engine?How is storage modulus and loss modulus relate with diffussivity of a drug molecule pass through a gel? Does higher storage modulus means lower difussivity?A getter screen consists of a cylinder of length l = 0.3m, diameter d=0.25m and its circular based plate. The getter screen is cooled with liquid nitrogen and coated completely with deposited titanium providing a constantly fresh surface. Sticking probability s=1 for N2 and mean thermal velocity = 470m/s. Find the pumping speed.
- In a glass production process, a glass plate of 0.5 m x 2 m and 3 mm thickness is cooled by air blown at a speed of 1 m/s from both sides. Air is blown parallel to the plate. The initial temperature of the glass plate is 425 C and the temperature of the air is 200 C. Calculate the temperature of the plate after cooling for 5 minutes. Properties of glass = 2500 kg/m3, c = 7600 J/kgK, k = 0.8 W/mKproperties of airThe forming section of a plastics plant puts out a continuous sheet of plastic that is 1.2 m wide and 2 mm thick at a rate of 15 m/min. The temperature of the plastic sheet is 90℃ when it is exposed to the surrounding air, and the sheet is subjected to air flow at 30℃ at a velocity of 3 m/s on both sides along its surfaces normal to the direction of motion of the sheet. The width of the air cooling section is such that a fixed point on the plastic sheet passes through that section in 2 s. Determine the rate of heat transfer from the plastic sheet to the air. (Answer: 437 W)Subject : Thermofluid Question : A boy threw a rubber ball into a lake. The spherical rubber ball has a diameter of 7.5 cm and a density of 1100 kg/m³ was dropped into the lake water with a temperature of 25°C. i. Determine the terminal velocity of the ball in the water. ii. Prove that the assumption you made for answering (i) is correct
- How does an increase in gas temperature affect pressure drop in a haghouse, assuming the mass flow rate of particles and the molar flow rate of gas are constant?Air at 100 Fahrenheit and 2 atm is being passed over a shallow bed of naphthalene spheres that are 0.5 inch in diameter at a superficial velocity (v0) of 5 fts^-1. The MW of naphthalene is 128.2 g mol^-1, and it’s diffusivity in air at these operating conditions is 0.033 cm^2s^-1. The porosity of the bed is 0.40, and the total surface area of the naphthalene particles is 86.3 ft^2 for each 1 ft^3 of packed bed.The viscosity of air under these conditions is 0.0184 cP and the density of air is 0.0023 g cm^-3. The equilibrium concentration of naphthalene in the air under these conditions is 0.006 mol L^-1. Assuming the concentration of the naphthalene in the air stream is negligible, estimate the initial evaporation rate of the naphthalene in pounds per second from 1 ft^3 of bed.A solar collecting panel 20 m2 in area receives solar energy at the rate of 750 W/m2. It is estimated that 35% of the incident energy is lost to surroundings. Water enters the panel at steady flow rate of 0.25 kg/s. Calculate the temperature of water leaving the collecting panel. Change in elevation of water is 2 meters.
- Dry air enters an industrial dryer with a pressure of 101 kPa, a temperature of 250*C, and a mass flow rate of 2.6kg/hr through a duct with a cross-sectional area of 0.85m^2. A wet material is placed inside the dryer, and its rate of drying is 5.5g/min. Determine the mass flow rate of gases leaving the dryer and the average velocity of air entering the dryer, assuming steady operation.The dimension of diffusion coefficient is ?? Explain.An one piece window, surface area of 14 m2 and thickness of 5.0 mm, has inner surface temperature of 10 °C, and outer surface temperature is -10 °C. Calculate the con- duction rate through the window. Use 0.80 W/(K·m) for the thermal conductivity of the glass.